53981680 has 20 divisors (see below), whose sum is σ = 125507592. Its totient is φ = 21592640.

The previous prime is 53981651. The next prime is 53981687. The reversal of 53981680 is 8618935.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53981687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337306 + ... + 337465.

Almost surely, 2^53981680 is an apocalyptic number.

It is an amenable number.

53981680 is an abundant number, since it is smaller than the sum of its proper divisors (71525912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53981680 is a wasteful number, since it uses less digits than its factorization.

53981680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674784 (or 674778 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 53981680 is about 7347.2226044948. Note that the first 3 decimals coincide. The cubic root of 53981680 is about 377.9335661456.

The spelling of 53981680 in words is "fifty-three million, nine hundred eighty-one thousand, six hundred eighty".